Watch: The 5 Most-Viewed Proposals on YouTube

If you weren't surprised with your own caught-on-camera proposal in 2011, chances are you participated in one (flash mobs require mobs, after all), or at the very least contributed to the millions of views proposals generated on YouTube this year.

Leading the pack of engagements-gone-viral was a cinematic-themed proposal one man staged back in May when his girlfriend went to see Fast Five with her brother. The lights dimmed, the screen rolled out, and then he...well, you'll have to watch to find out why this proposal earned more than 20 million views in a matter of months. And follow the jump to see the remaining videos rounding out the top five. —Phillip B. Crook